<SEC-DOCUMENT>0001213900-26-039386-index.html : 20260402
<SEC-HEADER>0001213900-26-039386.hdr.sgml : 20260402
<ACCEPTANCE-DATETIME>20260402163006
ACCESSION NUMBER:		0001213900-26-039386
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20260331
FILED AS OF DATE:		20260402
DATE AS OF CHANGE:		20260402

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Heinberg Marshall A
		CENTRAL INDEX KEY:			0001481338
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38186
		FILM NUMBER:		26834209

	MAIL ADDRESS:	
		ADDRESS IS A NON US LOCATION: 	YES
		STREET 1:		1 CORPORATE AVENUE
		STREET 2:		LATHAM & WATKINS LLP
		CITY:			ROWVILLE
		NON US STATE TERRITORY:  	ONTARIO
		PROVINCE COUNTRY:   	C3
		ZIP:			3178

	FORMER NAME:	
		FORMER CONFORMED NAME:	Heinberg Marshall S
		DATE OF NAME CHANGE:	20250826

	FORMER NAME:	
		FORMER CONFORMED NAME:	Heinberg Marshall
		DATE OF NAME CHANGE:	20100119

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Custom Truck One Source, Inc.
		CENTRAL INDEX KEY:			0001709682
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-EQUIPMENT RENTAL & LEASING, NEC [7359]
		ORGANIZATION NAME:           	07 Trade & Services
		EIN:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		7701 INDEPENDENCE AVENUE
		CITY:			KANSAS CITY
		STATE:			MO
		ZIP:			64125
		BUSINESS PHONE:		(816) 241-4888

	MAIL ADDRESS:	
		STREET 1:		7701 INDEPENDENCE AVENUE
		CITY:			KANSAS CITY
		STATE:			MO
		ZIP:			64125

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NESCO HOLDINGS, INC.
		DATE OF NAME CHANGE:	20190730

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Capitol Investment Corp. IV
		DATE OF NAME CHANGE:	20170619
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>ownership.xml
<TEXT>
Document 1 - file: ownership.html

Document 1 - RAW XML: ownership.xml

</DOCUMENT>
</SEC-DOCUMENT>